imperscriptible
Related to imperscriptible: imperceptible
imperscriptible
(ˌɪmpəˈskrɪptɪbəl)adj
not supported by written authority
[C19: from im- (not) + Latin perscribere to write down]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014